Monday, 30 May 2011

Body Movements : Lesson 8 : NCERT Class VI Science

Exercises : Questions & Answers

1.Question.Fill in the blanks.
Answer. (a) Joints of the bones help in the movement of the body.
(b) A combination of bones and cartilages forms the skeleton
(c) The bones at the elbow are joined by a hinge joint.
(d) The contraction of the muscles pulls the bones during.

2.Question. Indicate the True or False among the following sentences.
Answer. (a) The movements and locomotion of all animals is exactly the same.(F)
(b) The cartilages are harder than bones. (F)
(c) The finger bones do not have joints. (F)
(d) The for arms has two bones.(T)
(e) Cockroaches have an outer skeleton.(T)

3.Question.Match the items in column I with one or more items of column II. Column I Column II (a) Upper jaw________ is an immovable joint. (b)Fish____________ have fins on the body, haves streamlined body.(c) Ribs_____________ protect the heart.(d)Snail____________ show very slow.(e) Cockroach________ has an outer skeleton, can fly in air.

4.Question. Answer the following:
(a) What is a ball socket joint?
(b) Which of the skull bones are movable?
(c) Why can our elbow not move backward?
Answer. (a) The rounded end of one bones first into the cavity (hollow space)of the other bone. such a joint allows movements in all directions.
(b) Lower jaw.
(c) Elbow cannot move backward because it has hinge joint which allows only back and forth movements.